These websites can be used to edit and modify images

Pixlr
Pixlr.png
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Website:
http://pixlr.com/
Distribution:
In browser, flash plug-in or Download (iPhone or Android)
Anonymous User:
Create, edit, and download images
Logged-in User:
Save images to account
Email Use:
Required for log-in account creation
Paid Option:
N/A
Comparison:
Very robust image editing, Easy to learn for experienced
Photoshop users, limited pre-made options
Description:
User can upload an image or find an image online and
manipulate the image through the advanced tools in the editor
or simple tools in Express or Pixlr-O-Matic.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

Fotoflexer
fotoflexer.png
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Website:
http://fotoflexer.com/
Distribution:
In browser, flash plug-in required
Anonymous User:
Create, edit and download images
Logged-in User:
Save images to account
Email Use:
Required for log-in account creation
Paid Option:
N/A
Comparison:
Easy to use, emphasis on "smart" tools to automatically define
objects, pre-made animated stamps and fonts available,
can be sluggish to use
Description:
User can upload an image or find an image online and
manipulate the image with different brushes and snipping tools
to decorate and distort the image.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

LunaPic
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Website:
http://www.lunapic.com/
Distribution:
In browser
Anonymous User:
Create, edit and download images
Logged-in User:
Save images to account
Email Use:
Required for log-in account creation
Paid Option:
N/A
Comparison:
Tools very flexable, many automatic and animated effects from
effects menu, remembers actions as completed, many ads on
borders
Description:
User can upload an image or find an image online and
manipulate the image with different brushes and snipping tools
to decorate and distort the image.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

Picnik
Picnik.png
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Website:
http://www.picnik.com/
Distribution:
In browser, flash plug-in required
Anonymous User:
Create, edit and download images
Logged-in User:
N/A
Email Use:
N/A
Paid Option:
N/A
Comparison:
Very easy to use, Many brush type tools accurately "guess"
what change should happen instead of functioning as a screen,
No animation effects or layers
Description:
User can upload an image or find an image online and
manipulate the image with different brushes and snipping tools
to decorate and distort the image.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

Phoenix
Phoenix.png
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Website:
http://advanced.aviary.com/tools/image-editor
Distribution:
In browser, flash plug-in or Download (iPhone or Android)
Anonymous User:
Create, edit and download images
Logged-in User:
Save images to account
Email Use:
Required for log-in account creation
Paid Option:
N/A
Comparison:
Easy to use, allows works in progress to be saved to a local
computer, familiar controls to Photoshop, not many effect
options
Description:
User can upload an image or find an image online and
manipulate the image with different brushes and snipping tools
to decorate and distort the image.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

Paint.net
Paint.png
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Website:
http://www.getpaint.net/
Distribution:
Download (Windows XP or higher, .NET framework also
required)
Anonymous User:
Download and run program
Logged-in User:
N/A
Email Use:
N/A
Paid Option:
N/A
Comparison:
Very robust image editing tools, familiar controls to Photoshop
users, few preset effects available, no animation available
Description:
User can import an image and manipulate the image with
different brushes and snipping tools to decorate and distort
the image.
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.

GNU Image Manipulation Program (GIMP)
gimp.png
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Website:
http://www.gimp.org/
Distribution:
Download, (Windows XP, Mac 10.4, Linux or higher)
Anonymous User:
Download and run program
Logged-in User:
N/A
Email Use:
N/A
Paid Option:
N/A
Comparison:
Familiar controls to Photoshop users, many effects available,
not the easiest to learn, tends to open new windows
Description:
User can import an image and manipulate the image with
different brushes and snipping tools to decorate and distort
the image
Uses:
User could combine several photos to recreate a historic scene,
create a collage of multiple images with a single theme, or
remake a classic image in a unique way.